The Red Bulls ruined another fantastic regular season with another failed postseason. It’s kind of their thing.

In a week that saw the Cubs’ century-plus World Series drought broken, the Red Bulls got their hearts broken instead. They were upset in the Eastern Conference semifinals by Montreal. An original league team left another year without ever having won an MLS Cup.

The top-seeded Red Bulls got knocked out by an aggregate 3-1 scoreline, after falling 2-1 to the visiting Impact in Sunday’s second leg of a home-and-home.

“We knocked out an important team. But we knew they’re a weak team in [the] playoffs,’’ crowed Montreal midfielder Ignacio Piatti, who scored both Impact goals Sunday. “They showed that last year, this year.”

Rough. But is it wrong? The Red Bulls haven’t proven otherwise.

After finishing atop the East in both seasons under coach Jesse March — and three of the last four overall — this Red Bull golden era is tarnished. They haven’t reached an MLS Cup final in that sustained run, their latest hopes dashed before a crowd of 24,314 at Red Bull Arena that has seen this act all too often.

“We don’t make plays when it counts. I think it’d be pretty harsh to say that we choke, but certainly not out of the realm of possibility that that’s the case,’’ captain Dax McCarty said. “We have pretty good regular seasons, dominant regular seasons. Unfortunately in the playoffs … we get it wrong in a lot of different areas.”

Most important, they got it wrong in both boxes. After rolling into the playoffs on a 20-game undefeated streak overall — 16 in-league — they got blanked in both games by bunkering Montreal. The Red Bulls outshot the Impact 17-7 and held 64.5 percent of the possession, but it wasn’t enough.

“I’m gutted for my team, my staff, my organization and my fan base, because everybody has poured their hearts into this,’’ said Marsch, consoled on the field by assistant Chris Armas. “I feel a big sense of disappointment in our inability to win the Cup, period. We feel like we’ve had two great seasons here, but in the end we’re walking away empty-handed. It’s a hard feeling to swallow.”

The game left Sacha Kljestan struggling to swallow or breathe, after an injured nose.

After Gonzalo Veron drew a penalty by outrunning keeper Evan Bush to a ball in the box, Kljestan went left on the ensuing kick but saw his attempt saved in the 21st minute.

Minutes later, Kljestan went up to contest a header with Marco Donadel and took a shot to the nose. He came off the field in the 24th, his nose bent and twisted and bleeding profusely. The Red Bulls played a man down for a full dozen minutes as he was being worked on.

Kljestan came back on in the 37th, but they couldn’t unlock Montreal’s bunkering defense. And Piatti put the visitors up in the 51st, beating right back Chris Duvall and blasting a left-footed shot that keeper Luis Robles could only deflect.

“I got outplayed by Evan Bush,’’ Robles said. “He had a great series and made some big plays for his team. I didn’t make enough plays and that’s what it comes down to.”

Wright-Phillips equalized in the 77th, but Piatti put it away in the 85th off a feed from Didier Drogba.

“If I score my penalty it’s a very different conversation,” said Kljestan, who’ll get X-rays Monday and head to U.S. national team camp for Friday’s World Cup qualifier versus Mexico. “Those types of plays make differences; that’s why I feel like I let the team down.”